What is the role of the compression fraction in CPR?

The role of the compression fraction in CPR is crucial for ensuring the effectiveness of chest compressions, which are the most critical component of cardiopulmonary resuscitation. The compression fraction refers to the proportion of time during a cardiac arrest scenario when chest compressions are being delivered compared to the total time of the resuscitation effort.

Maximizing the compression fraction helps to ensure that a sufficient amount of time is spent delivering compressions to maintain blood flow, which is vital for oxygenating the brain and other vital organs during cardiac arrest. Studies have demonstrated that higher compression fractions correlate with improved outcomes in patients undergoing CPR, as prolonged interruptions can lead to decreased perfusion and worse survival rates.

Focusing on the delivery of compressions, rather than on minimizing interruptions for ventilations or aiming for patient comfort, emphasizes the importance of maintaining a high compression fraction. The correct answer highlights the significance of maximizing the number of compressions within the available time, which directly contributes to the efficacy of the resuscitation effort.